This is a relatively simple hack, converting a set top DVD player into a battery powered portable, complete with mini LCD. The firmware was swapped with a hacked version to allow some awesome capabilities...

A lot of times the Euro models have more features than us in the USA...the hardware is often identical, and this can work *in some cases*. Sometimes you can't swap firmware without your US unit becoming a PAL only unit thus not working on your USA tv any more...but in other cases, "hackers" have modded the Euro firmware to output in American NTSC.